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CONDENSED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 57,282 $ 9,925
Restricted cash 363 363
Marketable securities 140,959 186,350
Interest and other receivables 714 722
Prepaid and other current assets 2,444 2,497
Total current assets 201,762 199,857
Noncurrent marketable securities 40,521 63,387
Property and equipment, net 590 658
Operating leases, right-of-use assets 5,029 5,295
Deposits and other assets 4,273 1,531
Total assets 252,175 270,728
Current liabilities:    
Accounts payable 3,758 6,919
Accrued compensation and benefits 5,216 8,218
Operating lease liabilities 889 878
Accrued liabilities 27,150 14,925
Total current liabilities 37,013 30,940
Noncurrent operating lease liabilities 4,540 4,799
Noncurrent debt 34,416 24,042
Commitments and contingencies
Stockholders' equity:    
Common stock 321 310
Additional paid-in capital 1,388,909 1,366,188
Accumulated deficit (1,213,027) (1,155,629)
Accumulated other comprehensive gain 3 78
Total stockholders' equity 176,206 210,947
Total liabilities and stockholders' equity $ 252,175 $ 270,728